replaced oil cooler and stc fitting last week. drove the truck a lot... including a 400 mile trip pulling a 14,000# camper. no problems.

truck sat for a week. went to start it today and I've got nothing. Lights turn on, dash lights up... things seem to be cycling when i turn it to the 'on' position -- but when i got to crank i get nothing but a faint click. batteries are at 12.5v. all fuses look good.

Sorry since you knew the tap the starter trick, you would know the turn the crank trick.

From under the truck feal the inside the bottom pulley(harmonic balancer) for the 3 bolts find a socket that fits and put a ratchet or breaker bar on one of them preferably towards the top and try to roll the engine around at least a 1/2 turn ineither direction should do it, you can also try tapping while you turn. Just do not get crazey with the hammer.

The pancake solenoid will have 2 big studs with big wires and 1 small one.
Batt voltage will be on one side none on the other.
When you turn on the key to crank the small wire should get 12v and the other side should get voltage that then goes to the starter.

I just reread your post if you applied bat volts to the starter with that wire you bypassed all that and the starter should have rolled over. So your either bound up in the flywheel or your starter is dead/frozeup.

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